Read-Only RAID-5 on DVD? :-)

[Daniel Carrera]

On Mon, 2006-03-07 at 03:20 +0300, Harijs Buss wrote:
> On Monday 03 July 2006 02:25, ubuntu at rio.vg rakstija:
> 
> > I'm reasonably certain that isn't possible.  The filesystem used on CDs
> > and DVDs doesn't support raiding, as far as I'm aware.  
> 
> File systems are not fixed and limited for the rest of eternity... I mean 
> there are different file systems for different purposes, and easily might be 
> one more for DVD RAID :)

The problem with DVD RAID is:
1) DVD media are inherently (physically) such that you can't get random
access (unlike hard disks); you need to write continuously and
sequentially from end to end.
2) What's the point of having 3 DVD drives? You might as well use 3 hard
drives and get 40 times more space with more reliability (hard disks are
bigger and more reliable than DVDs).


> > Moreover, you'd need a single machine with at least 3 DVD-ROM 
> > drives to read the disks,  which rather cuts down on their usefulness.
> 
> Nope, files might be assembled reading sequentially each DVD, just like p2p 
> programs are assembling files as different fragments arrive.

That is *not* RAID.



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